Book Image

Hands-On Computer Vision with Julia

By : Dmitrijs Cudihins
Book Image

Hands-On Computer Vision with Julia

By: Dmitrijs Cudihins

Overview of this book

Hands-On Computer Vision with Julia is a thorough guide for developers who want to get started with building computer vision applications using Julia. Julia is well suited to image processing because it’s easy to use and lets you write easy-to-compile and efficient machine code. . This book begins by introducing you to Julia's image processing libraries such as Images.jl and ImageCore.jl. You’ll get to grips with analyzing and transforming images using JuliaImages; some of the techniques discussed include enhancing and adjusting images. As you make your way through the chapters, you’ll learn how to classify images, cluster them, and apply neural networks to solve computer vision problems. In the concluding chapters, you will explore OpenCV applications to perform real-time computer vision analysis, for example, face detection and object tracking. You will also understand Julia's interaction with Tesseract to perform optical character recognition and build an application that brings together all the techniques we introduced previously to consolidate the concepts learned. By end of the book, you will have understood how to utilize various Julia packages and a few open source libraries such as Tesseract and OpenCV to solve computer vision problems with ease.
Table of Contents (11 chapters)
9
Assessments

Saving images

You have already learned how to load and download images, so now it's time to learn how to save your image. We will use the save function from the Images package to save the image to disk.

The save function accepts two arguments:

  • The destination file location and name
  • The image object

Let's have a look at the code to save images:

  # load an image
img = load("sample-images/cats-3061372_640.jpg")

# save file in JPG format
save("my_new_file.jpg", img)

# save file in PNG format
save("my_new_file.png", img)

The image format is chosen based on the filename extension. Please note that saving the image in different formats can affect the output quality and file size. Users should find a balance between size and quality.

The save function does not allow you to set image quality, which is usually available in graphics editors, such as GIMP.